Kabushiki Kaisha Toshiba

Kazuki Yano

Yutaka Takeuchi

Hiroshi Ono

Hiroyuki Takeuchi

Provide a nuclear reactor power monitoring technology for enhancing the monitoring accuracy and reliability in nuclear thermal hydraulic stability. A power monitorincludes a first calculation unitconfigured to calculate a first stability index based on time series data indicating power oscillation in nuclear instrumentation signals outputted from a plurality of nuclear instrumentation detectors; a first determination unitconfigured to compare the first stability index and a first reference value and determine whether nuclear thermal hydraulic stability of the reactor core is stable or deteriorated; a second calculation unitconfigured to calculate a second stability index of the reactor core based on the time series data when the deteriorated state is determined in the first determination unit; and a second determination unitconfigured to compare the second stability index and a second reference value and determine whether to perform suppressing operation of the power oscillation.

Nuclear reactor power monitor

An apparatus for monitoring nuclear thermal hydraulic stability of a nuclear reactor, contains: a calculation unit configured to calculate a stability index of a nuclear thermal hydraulic phenomenon based on nuclear instrumentation signals, the signals being outputted by a plurality of nuclear instrumentation detectors placed at regular intervals in a reactor core; a simulation unit configured to simulate the nuclear thermal hydraulic phenomenon based on a physical model by using information on an operating state of the nuclear reactor as an input condition; a limit value updating unit configured to update a limit value of the nuclear thermal hydraulic phenomenon based on a result of the simulation; and a determination unit configured to determine, based on the stability index and the limit value, whether or not to activate a power oscillation suppressing device.

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Yokohama, Japan

Kazuki Yano